"""
M2Crypto-enhanced transport for PickleRPC

This lets you use M2Crypto for SSL encryption.

Based on m2xmlrpclib.py which is
    Copyright (c) 1999-2002 Ng Pheng Siong. All rights reserved
"""

from PickleRPC import Transport
import base64, string, sys
from M2Crypto import SSL, httpslib, m2urllib
try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

__version__ = 1   # version of M2PickleRPC

class M2Transport(Transport):
    user_agent = "M2PickleRPC.py/%s - %s" % (__version__, Transport.user_agent)

    def __init__(self, ssl_context=None):
        if ssl_context is None:
            self.ssl_ctx=SSL.Context('sslv23')
        else:
            self.ssl_ctx=ssl_context

    def make_connection(self, host):
        _host, _port = m2urllib.splitport(host)
        if sys.version[0] == '2':
            return httpslib.HTTPS(_host, int(_port), ssl_context=self.ssl_ctx)
        elif sys.version[:3] ==  '1.5':
            return httpslib.HTTPS(self.ssl_ctx, _host, int(_port))
        else:
            raise RuntimeError, 'unsupported Python version'

    # @@ workarounds below are necessary because M2Crypto seems to
    # return from fileobject.read() early!  So we have to call it
    # over and over to get the full data.
    
    def parse_response(self, f):
        """
        Workaround M2Crypto issue mentioned above
        """
        sio = StringIO()
        while 1:
            chunk = f.read()
            if not chunk:
                break
            sio.write(chunk)
        sio.seek(0)
        return Transport.parse_response(self, sio)

    def parse_response_gzip(self, f):
        """
        Workaround M2Crypto issue mentioned above
        """
        sio = StringIO()
        while 1:
            chunk = f.read()
            if not chunk:
                break
            sio.write(chunk)
        sio.seek(0)
        return Transport.parse_response_gzip(self, sio)